DESCRIPTION This DTC
(C1782) is output if voltage matching the DTC detection condition
continues to be supplied to the IGB terminal of the absorber control ECU
due to malfunctions in the power source or charging circuits, such as
the battery or generator assembly circuits. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Warning Indicate | Memory | |
C1782 | Low Battery Positive Voltage |
While the engine switch is on (IG), the voltage at terminal IGB is 10 V or less, or 16 V or more for 0.5 seconds. |
- AVS fuse
- IG1 NO. 3 relay
- Battery
- Charging system
- Wire harness or connector
- Absorber control ECU
| Does not come on |
No | WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- Before replacing the absorber control ECU, perform all of the following:
- Symptom simulation.
Click here 
- DTC inspection.
Click here
- Techstream inspection.
Click here
- If no malfunctions are found in other areas, replace the absorber control ECU.
- After replacing the absorber control ECU with a new one, perform registration of vehicle identification information.
Click here
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE |
1. | READ VALUE USING TECHSTREAM (IG POWER SOURCE VOLTAGE) |
(a) Turn the engine switch off. (b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG). (d) Turn the Techstream on.
(e) Enter the following menus: Chassis / Air suspension / Data List. Chassis > Air suspension > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
IG Power Source Voltage |
ECU power supply voltage |
Min.: 0.0 V Max.: 25.5 V |
11 to 14 V (Actual ECU power supply voltage): Engine switch on (IG) |
- | Chassis > Air suspension > Data List
|
Tester Display | | IG Power Source Voltage |
OK: The value is as specified in the normal condition column.
| NG |
 | GO TO STEP 3 |
|
OK |
 | |
(a) Clear the DTCs.
Click here Chassis > Air suspension > Clear DTCs
(b) Turn the engine switch off. (c) Check for DTCs. Click here
Chassis > Air suspension > Trouble Codes
|
Result | Proceed to | |
DTC is not output | A | |
DTC is output | B |
| A |
| USE SIMULATION METHOD TO CHECK |
| B |
| REPLACE ABSORBER CONTROL ECU |
(a) Check the battery voltage.
Standard Voltage: 11 to 14 V
| NG |
| CHECK OR REPLACE CHARGING SYSTEM OR BATTERY |
|
OK | |
| |
| 4. |
INSPECT IG1 NO. 3 RELAY | (a) Turn the engine switch off.
(b) Inspect the IG1 NO. 3 relay. Click here
| NG | |
REPLACE IG1 NO. 3 RELAY |
|
OK | |
| |
| 5. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE - IG1 NO. 3 RELAY) |
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
1 (IG1 NO. 3 relay) - Body ground |
Engine switch on (IG) |
11 to 14 V | |
5 (IG1 NO. 3 relay) - Body ground |
Always | 11 to 14 V |
| NG |
| CHECK OR REPLACE CHARGING SYSTEM OR BATTERY |
|
OK | |
| |
| 6. |
CHECK HARNESS AND CONNECTOR (IG1 NO. 3 RELAY - ABSORBER CONTROL ECU AND BODY GROUND) |
(a) Disconnect the K59 absorber control ECU connector. (b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
3 (IG1 NO. 3 relay) - K59-1 (IGB) |
Always | Below 1 Ω | |
3 (IG1 NO. 3 relay) or K59-1 (IGB) - Body ground |
Always | 10 kΩ or higher | |
2 (IG1 NO. 3 relay) - Body ground |
Always | Below 1 Ω |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 7. |
CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL ECU - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
K59-4 (GND) - Body ground |
Always | Below 1 Ω |
| OK |
| REPLACE ABSORBER CONTROL ECU |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
